Grpc-web: rpc error: code = Unavailable desc = connection closed before server preface received

[ma54ik]

Hi everyone,
I have the following problem:

Proto file(s)
syntax = "proto3";

option csharp_namespace = "GrpcWebDemo";

package greet;

// The greeting service definition.
service Greeter {
// Sends a greeting
rpc SayHello (HelloRequest) returns (HelloReply);
}

// The request message containing the user's name.
message HelloRequest {
string name = 1;
}

// The response message containing the greetings.
message HelloReply {
string message = 1;
}

Command line arguments / config
./ghz --insecure --proto .../Protos/greet.proto --call greet.Greeter.SayHello -d '{ "name": "Geralt!" }' localhost:9999

Describe the bug
Summary:
Count: 200
Total: 31.32 ms
Slowest: 0 ns
Fastest: 0 ns
Average: 2.10 ms
Requests/sec: 6385.72

Response time histogram:

Latency distribution:

Status code distribution:
[Unavailable] 200 responses

Error distribution:
[200] rpc error: code = Unavailable desc = connection closed before server preface received

Environment

• OS: Linux 5.13.19-2-MANJARO
• ghz: v0.117.0

I created a grpc-web hello world API in dotnet C# and tried the ghz-command mentioned above.
Grpcurl works well, but I like to use ghz for benchmark testing.
Is ghz working for grpc-web requests?
If it works, where is my mistake?

Best regards!

[ragmr]

Hi @ma54ik , any luck with testing grpc-web using ghz? I am in the similar situation where I need to test grpc-web requests and wondering if GHZ supports. Thanks